System board
Description | Spare part number |
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PM55 PCH | |
thermal material) |
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PM55 PCH | |
thermal material) |
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Before removing the system board, follow these steps:
1.Shut down the computer. If you are unsure whether the computer is off or in Hibernation, turn the computer on, and then shut it down through the operating system.
2.Disconnect all external devices connected to the computer.
3.Disconnect the power from the computer by first unplugging the power cord from the AC outlet, and then unplugging the AC adapter from the computer.
4.Remove the battery (see Battery on page 36).
5.Remove the following components:
a.Memory module compartment cover (see “Expansion memory module”).
b.Top cover (see Top cover on page 39
c.Speaker assembly (see “Speaker assembly”).
d.Hard drive (see Hard drive on page 49
e.Processor fan/heat sink assembly (see Processor fan/heat sink assembly on page 51
When replacing the system board, be sure that the following components are removed from the defective system board and installed on the replacement system board:
●Expansion and primary memory modules (see “Expansion memory module” and Primary memory module”).
●WLAN module (see WLAN module on page 46
●RTC battery (see RTC battery on page 48
●Processor (see “Processor”).
Remove the system board:
1.Disconnect the following cables from the system board:
●Power connector cable (1)
●Power button board cable (2)
●Bluetooth module cable (3)
●Ambient light sensor module cable (4)
58 Chapter 4 Removal and replacement procedures